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Using a Phillips screwdriver, remove the screw securing the pistol grip to the gun.

Remove the pistol grip from the gun.

Optional: remove the screw securing the buffer tube to the gun, then remove the buffer tube/stock assembly. A round nut should fall out of the buffer tube after the assembly is removed (shown in third picture).

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Remove the screw from the magazine catch. After the screw is removed, the magazine catch assembly should come apart in four pieces (screw, button, spring, arm).

Punch out the small receiver pin from the right side of the gun (see picture). It is important that you do not try to do this from the right side. One end of the pin is textured to prevent it from coming loose, and pushing this end through the receiver may cause minor damage.

Set the selector to "semi" and remove the fire control assembly from the lower receiver.

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Place the auto sear spring back in place as shown in the first picture.

Insert the pin and brass spacer halfway in, then place the auto sear in as shown in the second picture. Push the pin all the way in. The spring leg that sticks out should point towards the FRONT of the gun.

Put the trigger back in place, with the front of the striker resting on top of the brass spacer. Be sure to install the trigger spring properly. Place the hammer over the striker and install the pin through hammer and striker.